Test venv with different pythons in the path

demonstration.sh

#!/bin/bash -e

VENV_DIR=envdir

setup() {
    local asdf=$1
    local env=$2
    local python=$3
    local first=$4

    if [ -n "$env" ]; then
       export VIRTUALENV_PYTHON=$env
    fi

    if [ -z "$env" ]; then
	unset VIRTUALENV_PYTHON
    fi

    rm -rf "$VENV_DIR"
    virtualenv ${python:+--python=$python} ${first:+--try-first-with=$first} "$VENV_DIR" > /dev/null 2>&1

    . "$VENV_DIR/bin/activate"
    active=$(python --version | sed 's/^Python //')

    deactivate
    disactive=$(python --version | sed 's/^Python //')

    first=$(echo $first | sed s,$HOME,~,g)
    python=$(echo $python | sed s,$HOME,~,g)
    line="$asdf\t$VIRTUALENV_PYTHON\t$python\t$first\t$active\t$disactive"
    echo -e -n "$line\r" >&2
    echo -e "$line"
}

(
    version=("" "3.8.19" "3.9.19" "3.10.14" "3.11.9" "3.12.3")
    version=("" "3.9.19" "3.11.9" )
    short=()
    for ver in "${version[@]}"; do
	short+=( "${ver%.*}" )
	PATH="$PATH:$HOME/.asdf/installs/python/$ver/bin"
    done

    echo -e "asdf\tENV\t--python\t--try-first-with\tActivated\tDeactivated"
    for asdf in "${version[@]}"; do
	echo "python ${asdf:-system}" > .tool-versions
	for env in "${short[@]}"; do
	    for pyver in "${short[@]}"; do
		fullpyver="$pyver"
		test -z "$fullpyver" || fullpyver="$(echo $HOME/.asdf/installs/python/$pyver*/bin/python$pyver)"
		for first in "${short[@]}"; do
		    test -z "$first" || first="$(echo $HOME/.asdf/installs/python/$first*/bin/python$first)"
		    setup "$asdf" "$env" "$pyver" "$first"
		    test -z "$pyver" || setup "$asdf" "$env" "python$pyver" "$first"
		    test -z "$fullpyver" || setup "$asdf" "$env" "$fullpyver" "$first"
		done
	    done
	done
    done
) | column -t -s $'\t'

output.txt is the output of this.